THE INHERITANCE OP FAMILY TRAITS 37 



ternity derived from two such mulattoes having 45 per 

 cent and 13 per cent respectively of black in the skin, the 

 proportion of black in the 7 offspring whose color was 

 measured ranged from 46 to 6 (Fig. 13). The lighter limit 

 was as Ught as most Caucasian skins. In another fraternity 

 whose parents had 29 per cent and 13 per cent of black 

 respectively, the children ranged from 28 per cent to 8.5 

 per cent of black in the skin color. ^ 'Here, again, the light- 



Fig. 13. — Pedigree chart of '*W" family of mulattoes, showing the percent- 

 ages of the four colors; black (N)j yellow (K), red {R) and white (W) that 

 combined (as in the color wheel) will give the skin color, (f, male; 9, female. 

 For fuller details see Davenport, G. C, and C. B., 1910. 



est child has practically a white skin. In the case of the 

 two other families, in which the parents were dark mulat- 

 toes (30 to 40 per cent black) none of the children were 

 lighter than 27 per cent black. The germ cells of the parents 

 probably lack the lower grades of pigmentation. On the 

 other hand two very light "colored" parents will have 

 (probably) only light children, some of whom "pass for 

 whites" away from home. So far as skin color goes they 

 are as truly white as their greatgrandparent and it is quite 



^ All colors were determined by means of the Bradley color top. 



